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WinSCP-5.19.5 transfer slow

Internet: Unlimited @150 Mbps
Router to laptop connected with Ethernet cable.
Laptop connected with office VPN (Cisco Anyconnect)
External HDD (8 TB) connected to laptop
I want to transfer 7 TB data (each file around 800 GB) from HDD to my Linux network (HPC center).
I am using WinSCP-5.19.5 SFTP to transfer the file but speed is very slow (4 MB/s).
First file uploaded in 13 hr and second file uploaded in 24 hr, both file have 826 GB file size but transfer speed very fluctuating.
I have below questions:
1. Why speed is fluctuating?
2. How to increase the transfer speed?